#### § 87.173 Frequencies.

(a) The table in [paragraph (b)](/on/2024-09-20/title-47/section-87.173#p-87.173(b)) of this section lists assignable carrier frequencies or frequency bands.

(1) The single letter symbol appearing in the “Subpart” column indicates the subpart of this part which contains additional applicable regulations.

(2) The two or three letter symbol appearing in the “Class of Station” column indicates the class of station to which the frequency is assignable.

(b) Frequency table:

| Frequency or frequency band | Subpart | Class of station | Remarks |
| --- | --- | --- | --- |
| 90-110 kHz | Q | RL | LORAN “C”. |
| 190-285 kHz | Q | RLB | Radiobeacons. |
| 200-285 kHz | O | FAC | Air traffic control. |
| 325-405 kHz | O | FAC | Air traffic control. |
| 325-435 kHz | Q | RLB | Radiobeacons. |
| 410.0 kHz | F | MA | International direction-finding for use outside of United States. |
| 457.0 kHz | F | MA | Working frequency for aircraft on over-water flights. |
| 500.0 kHz | F | MA | International calling and distress frequency for ships and aircraft on over-water flights. |
| 510-535 kHz | Q | RLB | Radiobeacons. |
| 2182.0 kHz | F | MA | International distress and calling. |
| 2648.0 kHz | I | AX | Alaska station. |
| 2850.0-3025.0 kHz | I | MA, FAE | International HF. |
| 2851.0 kHz | I, J | MA, FAE, FAT | International HF; Flight Test. |
| 2866.0 kHz | I | MA, FAE | Domestic HF; (Alaska). |
| 2875.0 kHz | I | MA, FAE | Domestic HF. |
| 2878.0 kHz | I | MA1, FAE | Domestic HF; International HF. |
| 2911.0 kHz | I | MA, FAE | Domestic HF. |
| 2956.0 kHz | I | MA, FAE | Domestic HF. |
| 3004.0 kHz | I, J | MA, FAE, FAT | International HF; Flight Test. |
| 3019.0 kHz | I | MA1, FAE | Domestic HF; International HF. |
| 3023.0 kHz | F, M, O | MA1, FAR, FAC | Search and rescue communications. |
| 3281.0 kHz | K | MA, FAS | Lighter-than-air craft and aeronautical stations serving lighter-than-air craft. |
| 3400.0-3500.0 kHz | I | MA, FAE | International HF. |
| 3434.0 kHz | I | MA1, FAE | Domestic HF. |
| 3443.0 kHz | J | MA, FAT | Flight Test. |
| 3449.0 kHz | I | MA, FAE | Domestic HF. |
| 3470.0 kHz | I | MA, FAE | Domestic HF; International HF. |
| 4125.0 kHz | F | MA | Distress and safety with ships and coast stations. |
| 4550.0 kHz | I | AX | Gulf of Mexico. |
| 4645.0 kHz | I | AX | Alaska. |
| 4650.0-4700.0 kHz | I | MA, FAE | International HF. |
| 4672.0 kHz | I | MA1, FAE | Domestic HF. |
| 4947.5 kHz | I | AX | Alaska. |
| 5036.0 kHz | I | AX | Gulf of Mexico. |
| 5122.5 kHz | I | AX | Alaska. |
| 5167.5 kHz | I | FA | Alaska emergency. |
| 5310.0 kHz | I | AX | Alaska. |
| 5450.0-5680.0 kHz | I | MA, FAE | International HF. |
| 5451.0 kHz | J | MA, FAT | Flight Test. |
| 5463.0 kHz | I | MA1, FAE | Domestic HF. |
| 5469.0 kHz | J | MA, FAT | Flight Test. |
| 5472.0 kHz | I | MA, FAE | Domestic HF. |
| 5484.0 kHz | I | MA, FAE | Domestic HF. |
| 5490.0 kHz | I | MA, FAE | Domestic HF. |
| 5496.0 kHz | I | MA, FAE | Domestic HF. |
| 5508.0 kHz | I | MA1, FAE | Domestic HF. |
| 5571.0 kHz | J | MA, FAT | Flight Test. |
| 5631.0 kHz | I | MA, FAE | Domestic HF. |
| 5680.0 kHz | F, M, O | MA1, FAC, FAR | Search and rescue communications. |
| 5887.5 kHz | I | AX | Alaska. |
| 6525.0-6685.0 kHz | I | MA, FAE | International HF. |
| 6550.0 kHz | J | MA, FAT | Flight Test. |
| 6580.0 kHz | I | MA, FAE | Domestic HF. |
| 6604.0 kHz | I | MA, FAE | Domestic HF. |
| 8015.0 kHz | I | AX | Alaska. |
| 8364.0 kHz | F | MA | Search and rescue communications. |
| 8815.0-8965.0 kHz | I | MA, FAE | International HF. |
| 8822.0 kHz | J | MA, FAT | Flight Test. |
| 8855.0 kHz | I | MA, FAE | Domestic HF; international HF. |
| 8876.0 kHz | I | MA, FAE | Domestic HF. |
| 10005.0-10100.0 kHz | I | MA, FAE | International HF. |
| 10045.0 kHz | J | MA, FAT | Flight Test. |
| 10066.0 kHz | I | MA, FAE | Domestic HF; international HF. |
| 11275.0-11400.0 kHz | I | MA, FAE | International HF. |
| 11288.0 kHz | J | MA, FAT | Flight Test. |
| 11306.0 kHz | J | MA, FAT | Flight Test. |
| 11357.0 kHz | I | MA, FAE | Domestic HF. |
| 11363.0 kHz | I | MA, FAE | Domestic HF. |
| 13260.0-13360.0 kHz | I | MA, FAE | International HF. |
| 13312.0 kHz | I, J | MA, FAE, FAT | International HF; Flight Test. |
| 17900.0-17970.0 kHz | I | MA, FAE | International HF. |
| 17964.0 kHz | J | MA, FAT | Flight Test. |
| 21924.0-22000.0 kHz | I | MA, FAE | International HF. |
| 21931.0 kHz | J | MA, FAT | Flight Test. |
| 72.02-72.98 MHz | P | FA, AXO | Operational fixed. |
| 75.000 MHz | Q | RLA | Marker beacon. |
| 75.42-75.98 MHz | P | FA, AXO | Operational fixed. |
| 108.000 MHz | Q | RLT | |
| 108.000-117.950 MHz | Q | RLO | VHF omni-range. |
| 108.000-117.975 MHz | Q | DGP | Differential GPS. |
| 108.050 MHz | Q | RLT | |
| 108.100-111.950 MHz | Q | RLL | ILS Localizer. |
| 108.100 MHz | Q | RLT | |
| 108.150 MHz | Q | RLT | |
| 118.000-121.400 MHz | O, S | MA, FAC, FAW, GCO RCO, RPC | 25 kHz channel spacing |
| 121.500 MHz | G, H, I, J, K, M, O | MA, FAU, FAE, FAT, FAS, FAC, FAM | Emergency and distress. |
| 121.600-121.925 MHz | O, L, Q | MA, FAC, MOU, RLT, GCO, RCO, RPC | 25 kHz channel spacing. |
| 121.950 MHz | K | FAS | |
| 121.975 MHz | F, S | MA2, FAW, FAC, MOU | Air traffic control operations. |
| 122.000 MHz | F | MA, FAC, MOU | Air carrier and private aircraft enroute flight advisory service provided by FAA. |
| 122.025 MHz | F, S | MA2, FAW, FAC, MOU | Air traffic control operations. |
| 122.050 MHz | F | MA, FAC, MOU | Air traffic control operations. |
| 122.075 MHz | F, S | MA2, FAW, FAC, MOU | Air traffic control operations. |
| 122.100 MHz | F, O | MA, FAC, MOU | Air traffic control operations. |
| 122.125-122.675 MHz | F | MA2, FAC, MOU | Air traffic control operations; 25 kHz spacing. |
| 122.700 MHz | G, L, Q | MA, FAU, MOU, AVW | Unicom at airports with no control tower; Aeronautical utility stations. |
| 122.725 MHz | G, L, Q | MA, FAU, MOU, AVW | Unicom at airports with no control tower; Aeronautical utility stations. |
| 122.750 MHz | F, Q | MA2, AVW | Private fixed wing aircraft air-to-air communications. |
| 122.775 MHz | K | MA, FAS | |
| 122.800 MHz | G, L, Q | MA, FAU, MOU, AVW | Unicom at airports with no control tower; Aeronautical utility stations. |
| 122.825 MHz | I | MA, FAE | Domestic VHF. |
| 122.850 MHz | H, K, Q | MA, FAM, FAS, AVW. | |
| 122.875 MHz | I | MA, FAE | Domestic VHF. |
| 122.900 MHz | F, H, L, M, Q | MA, FAR, FAM, MOU, AVW | |
| 122.925 MHz | H | MA2, FAM | |
| 122.950 MHz | G, L, Q | MA, FAU, MOU, AVW | Unicom at airports with control tower; Aeronautical utility stations. |
| 122.975 MHz | G, L, Q | MA, FAU, MOU, AVW | Unicom at airports with no control tower; Aeronautical utility stations. |
| 123.000 MHz | G, L, Q | MA, FAU, MOU, AVW | Unicom at airports with no control tower; Aeronautical utility stations. |
| 123.025 MHz | F, Q | MA2, AVW | Helicopter air-to-air communications; Air traffic control operations. |
| 123.050 MHz | G, L, Q | MA, FAU, MOU, AVW | Unicom at airports with no control tower; Aeronautical utility stations. |
| 123.075 MHz | G, L, Q | MA, FAU, MOU, AVW | Unicom at airports with no control tower; Aeronautical utility stations. |
| 123.100 MHz | M, O | MA, FAC, FAR | |
| 123.125 MHz | J | MA, FAT | Itinerant. |
| 123.150 MHz | J | MA, FAT | Itinerant. |
| 123.175 MHz | J | MA, FAT | Itinerant. |
| 123.200 MHz | J | MA, FAT | |
| 123.225 MHz | J | MA, FAT | |
| 123.250 MHz | J | MA, FAT | |
| 123.275 MHz | J | MA, FAT | |
| 123.300 MHz | K, Q | MA, FAS, AVW. | |
| 123.325 MHz | J | MA, FAT | |
| 123.350 MHz | J | MA, FAT | |
| 123.375 MHz | J | MA, FAT | |
| 123.400 MHz | J | MA, FAT | Itinerant. |
| 123.425 MHz | J | MA, FAT | |
| 123.450 MHz | J | MA, FAT | |
| 123.475 MHz | J | MA, FAT | |
| 123.500 MHz | K, Q | MA, FAS, AVW. | |
| 123.525 MHz | J | MA, FAT | |
| 123.550 MHz | J | MA, FAT | |
| 123.575 MHz | J | MA, FAT | |
| 123.6-128.8 MHz | O, S | MA, FAC, FAW, GCO, RCO, RPC | 25 kHz channel spacing. |
| 128.825-132.000 MHz | I | MA, FAE | Domestic VHF. |
| 131.450 MHz | I | DLT. | |
| 131.550 MHz | I | DLT. | |
| 131.725 MHz | I | DLT. | |
| 131.825 MHz | I | DLT. | |
| 132.025-135.975 MHz | O, S | MA, FAC, FAW, GCO RCO RPC | 25 kHz channel spacing. |
| 136.000-136.400 MHz | O, S | MA, FAC, FAW, GCO, RCO, RPC | Air traffic control operations; 25 kHz channel spacing. |
| 136.425 MHz | O, S | MA, FAC, FAW, GCO, RCO, RPC | Air traffic control operations. |
| 136.450 MHz | O, S | MA, FAC, FAW, GCO, RCO, RPC | Air traffic control operations. |
| 136.475 MHz | O, S | MA, FAC, FAW, GCO, RCO, RPC | Air traffic control operations. |
| 136.500-136.875 MHz | I | MA, FAE | Domestic VHF; 25 kHz channel spacing. |
| 136.850 MHz | I | DLT. | |
| 136.900 MHz | I | MA, FAE, DLT | International and Domestic VHF. |
| 136.925 MHz | I | MA, FAE, DLT | International and Domestic VHF. |
| 136.950 MHz | I | MA, FAE, DLT | International and Domestic VHF. |
| 136.975 MHz | I | MA, FAE, DLT | International and Domestic VHF. |
| 156.300 MHz | F | MA | For communications with ship stations under specific conditions. |
| 156.375 MHz | F | MA | For communications with ship stations under specific conditions; Not authorized in New Orleans Vessel traffic service area. |
| 156.400 MHz | F | MA | For communications with ship stations under specific conditions. |
| 156.425 MHz | F | MA | For communications with ship stations under specific conditions. |
| 156.450 MHz | F | MA | For communications with ship stations under specific conditions. |
| 156.625 MHz | F | MA | For communications with ship stations under specific conditions. |
| 156.800 MHz | F | MA | Distress, safety and calling frequency; For communications with ship stations under specific conditions. |
| 156.900 MHz | F | MA | For communications with ship stations under specific conditions. |
| 157.425 MHz | F | MA | For communications with commercial fishing vessels under specific conditions except in Great Lakes and St. Lawrence Seaway Areas. |
| 243.000 MHz | F | MA | Emergency and distress frequency for use of survival craft and emergency locator transmitters. |
| 328.600-335.400 MHz | Q | RLG | ILS glide path. |
| 334.550 MHz | Q | RLT | |
| 334.700 MHz | Q | RLT | |
| 406.0-406.1 MHz | F, G, H, I, J, K, M, O | MA, FAU, FAE, FAT, FAS, FAC, FAM | Emergency and distress. |
| 960-1215 MHz | F, Q | MA, RL, RNV | Electronic aids to air navigation. |
| 978.000 MHz | F, L, Q | MA, MOU, UAT | Universal Access Transceivers. |
| | UAT | | |
| | Q | RLT | |
| 979.000 MHz | Q | RLT | |
| 1030.000 MHz | Q | RLT. | |
| 1090.000 MHz | L | MOU, RLT | Vehicle Squitter. |
| 1104.000 MHz | Q | RLT | |
| 1300-1350 MHz | F, Q | MA, RLS | Surveillance radars and transponders. |
| 1435-1525 MHz | F, J | MA, FAT | Aeronautical telemetry and telecommand operations. |
| 1559-1610 MHz | Q | DGP | Differential GPS. |
| 1559-1626.5 MHz | F, Q | MA, RL | Aeronautical radionavigation. |
| 1646.5-1660.5 MHz | F | TJ | Aeronautical Mobile-Satellite (R). |
| 2345-2395 MHz | J | MA, FAT | Aeronautical telemetry and telecommand operations. |
| 2700-2900 MHz | Q | RLS, RLD | Airport surveillance and weather radar. |
| 4200-4400 MHz | F | MA | Radio altimeters. |
| 5030-5150 MHz | Q | MA, RLW | Microwave landing systems. |
| 5031.000 MHz | Q | RLT | |
| 5091-5150 MHz | J | MA, FAT | Aeronautical telemetry. |
| 5350-5470 MHz | F | MA | Airborne radars and associated airborne beacons. |
| 8750-8850 MHz | F | MA | Airborne doppler radar. |
| 9000-9200 MHz | Q | RLS, RLD | Land-based radar. |
| 9300-9500 MHz | F, Q | MA | Airborne radars and associated airborne beacons. |
| 13250-13400 MHz | F | MA | Airborne doppler radar. |
| 15400-15700 MHz | Q | RL | Aeronautical radionavigation. |
| 24450-24650 MHz | F, Q | MA, RL | Aeronautical radionavigation. |
| 32300-33400 MHz | F, Q | MA, RL | Aeronautical radionavigation. |

[[53 FR 28940](https://www.federalregister.gov/citation/53-FR-28940), Aug. 1, 1988]

###### Editorial Note

#### Editorial Note:

For Federal Register citations affecting [§ 87.183](/on/2024-09-20/title-47/section-87.183), see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at *[www.govinfo.gov](http://www.govinfo.gov).*